A kind of ternary positive electrode material for lithium ion secondary battery and preparation method thereof

A technology of positive electrode material and secondary battery, applied in the field of high-nickel ternary positive electrode material and its preparation, can solve the problems of unfavorable battery, poor safety, battery safety hazards, etc. Discharge capacity, the effect of easy industrialization

A technology of positive electrode material and secondary battery, applied in the field of high-nickel ternary positive electrode material and its preparation, can solve the problems of unfavorable battery, poor safety, battery safety hazards, etc. Discharge capacity, the effect of easy industrialization

CN113113575BActive Publication Date: 2022-07-12WANHUA CHEM GRP CO LTD
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  • A kind of ternary positive electrode material for lithium ion secondary battery and preparation method thereof
  • A kind of ternary positive electrode material for lithium ion secondary battery and preparation method thereof
  • A kind of ternary positive electrode material for lithium ion secondary battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] step 1):

[0050] To the ternary precursor A (Ni 0.8 Co 0.1 Mn 0.1 )(OH) 2 Add 2000ppm ZrO 2 (aladin reagent) and 1000 ppm SrO (aladin reagent), to a ternary precursor B (Ni 0.8 Co 0.1 Mn 0.1 )(OH) 2 Add 800ppm ZrO 2 (aladin reagent) and 400ppm SrO (aladin reagent), mix them evenly, and then add LiOH to precursor A and precursor B according to the same molar ratio (Li:(Ni+Co+Mn)=1.02:1) ·H 2 O (manufactured by Ganfeng Lithium Industry), respectively mix well to obtain material A and material B;

[0051] After that, in an oxygen atmosphere, material A and material B were calcined at 750°C and 780°C, respectively, and both material A and material B were calcined for 10 hours, and a sintering was performed to obtain a sintered material A and a sintered material B in turn;

[0052] The ICP detection shows that the total doping mass ratio of Zr element and Sr element in the crystal structure of primary sintered material A is 2280 ppm, and the total doping mass rat...

Embodiment 2

[0063] Basically the same as Example 1, the difference is that in step 1), the following changes are made: 3000ppm ZrO is added to the ternary precursor A with a median particle size of 4 μm 2 and 500ppm SrO, adding 100ppm ZrO to the ternary precursor B with a median particle size of 10μm 2 and 100ppm SrO, respectively, and mix well. Other conditions remain unchanged, the final result is a ternary cathode material with a median particle size of 7 μm, Zr doping of 1200 ppm, Sr doping of 200 ppm, and surface-coated conductive carbon accounting for 2% of the total mass. Remove the surface-coated conductive carbon. Its structural formula is: Li 1.01 Ni 0.8 Co 0.1 Mn 0.1 Zr 0.0012 Sr 0.0003 O 2 .

[0064] In this embodiment, the ICP detection shows that the total doping mass ratio of Zr element and Sr element in the crystal structure of the primary sintered material A is 2660 ppm, and the total doping mass ratio of Zr element and Sr element in the crystal structure of the p...

Embodiment 3

[0066] It is basically the same as Example 1, except that the following changes are made in step 1): 1000ppm ZrO is added to the ternary precursor A with a median particle size of 4 μm 2 and 500ppm SrO, adding 100ppm ZrO to the ternary precursor B with a median particle size of 10μm 2 and 1000ppm SrO, respectively, and mix well. With other conditions unchanged, the final result is a ternary cathode material with a median particle size of 7 μm, Zr doping of 300 ppm, Sr doping of 700 ppm, and surface-coated conductive carbon accounting for 2% of the total mass. Remove the surface-coated conductive carbon. Its structural formula is: Li 1.01 Ni 0.8 Co 0.1 Mn 0.1 Zr 0.0004 Sr 0.0008 O 2 .

[0067] In this example, according to ICP detection, the total doping mass ratio of Zr element and Sr element in the crystal structure of primary sintered material A is 1170 ppm, and the total doping mass ratio of Zr element and Sr element in the crystal structure of primary sintered mate...

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Abstract

The invention provides a ternary positive electrode material for a lithium ion secondary battery and a preparation method thereof. The method of the invention can improve the electronic conductivity and ionic conductivity of the ternary positive electrode material for a lithium ion secondary battery under low temperature conditions, thereby improving the ternary positive electrode material. Low temperature output characteristics of cathode materials. The preparation method includes the following steps: 1) adding a metal oxide to a ternary precursor A with a median particle size of 3-5 μm and adding a lithium source to obtain a material A; adding a ternary precursor A with a median particle size of 8-12 μm Add a metal oxide to the precursor B and add a lithium source to obtain a material B; sinter to obtain a calcined material A and B; 2) respectively add it to the gelatin aqueous solution, stir and dry to obtain a gel A and a gel B; 3) freeze the The dried gels A and B are calcined to obtain secondary sintered materials A and B coated with conductive carbons of different coating amounts; 4) batch mixing of secondary sintered materials A and B to obtain lithium ion secondary battery III Element cathode material.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials for lithium ion batteries, and in particular relates to a high-nickel ternary positive electrode material with excellent performance and a preparation method thereof. Background technique [0002] Lithium-ion secondary batteries have been rapidly applied to all aspects of people's production and life since their inception due to their high specific discharge capacity, long cycle life, low self-discharge rate, and good environmental friendliness. However, with the rapid development of the new energy industry, power batteries have put forward higher requirements for energy density, safety, and cycle life, and conventional lithium-ion batteries are therefore also faced with huge challenges. At present, ternary materials have received extensive attention due to their high discharge specific capacity and energy density. [0003] Ternary materials are composed of microspheres with ...

Claims

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Application Information

Patent Timeline
12 Jul 2022
Publication
CN113113575B
IPC
H01M4/36; H01M4/505; H01M4/525; H01M4/62; H01M10/0525
CPC
H01M4/505; H01M4/525; H01M4/362; H01M4/625; H01M10/0525; H01M2004/028; Y02E60/10
Inventors
邵洪源